Ah good to know. Well my new res is here and i've got some alternate innovatek tubing to try so hopefully I will get some time to swap it all out - that combined with the new fluid might solve it. If it doesn't i'm going back to redline water wetter because really it's never given me any problems. Half tempted to run it on plain water this weekend to avoid doing a build till next week as i'll only have a small amount of time due to finishing our dining room in time for xmas..
Have to say though that HPD cleaner did make the pipes crystal clear again.